单项选择题
A．Study the case carefully beforehand. B．Stick to a set target. C．Appear friendly to the other party. D．Try to be flexible about their terms.
A．Experience in negotiating. B．A high level of intelligence. C．The time they spend on preparation. D．The amount of pay they receive.
A．Because people might have to migrate there someday. B．Because it is very much like the earth. C．Because it is easier to explore than other planets. D．Because its atmosphere is different from that of the earth.